Parallel Lines, Two distinct coplanar lines that do not intersect., Obtuse Angle, An angle that measures more than 90° and less than 180°, Right Angle, A 90° angle., Acute Angle, An angle that measures less than 90°., Triangle, A polygon with three sides., a2 + b2 = c2, Pythagorean theorem., \pi r2, Area of a circle., 2 \pi r, Circumference of a circle., Arc of a circle, A connected section of the circumference of a circle., h (b_1+b_2)/2, Area of trapezium..

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